P2440AIR System Switching Valve Stuck Open (Bank 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2440 means the bank 1 secondary air shut-off (switching) valve stays open when it should be closed. GM tests it in phase 2 of its air check: the pump runs while the valve is commanded shut, so pressure in the duct should build; if it stays more than 3 kPa below the model (2005–2006 3.8L V6) or under the 2018 table limit, the code sets as Type B. Volkswagen compares measured with modelled pressure while the valve is closed (2014 Beetle below 71.1 %, Golf 2.5L below 64.8 %). Toyota and Lexus see it on 2UZ-FE, 1UR-FE and 1GR-FE trucks, often after pump debris jams the valve (T-SB-0230-12, L-SB-0028-14, T-SB-0033-17); Subaru's 2011–2015 STI guidance says to check both banks. An open valve lets hot exhaust reach the pump.
- What you may notice
- Check engine lamp after a cold start
- Pump noisy or failing later due to exhaust backflow
- Often stored together with P2442 or P2445
- Likely causes
- LikelyValve held open by debris from a damaged pump filter
- PossibleValve seat carboned up or corroded by condensate
- PossibleElectric or vacuum actuator does not close the valve
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €120 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.